SALE 4 mm Silvery Champagne Diamond Solitaire Ring in American Silver Size 7 $149.00 0.22 CT natural diamond grades from a champagne to pure silver to completely colorless at the very tip, The diamond is round, brilliant cut, 4 mm diameter with a clarity of I1 for a surface inclusion. . Size 7. American silver, mined in Arizona. 24K gold veneer (vermeil) is available for $30.00.